Hi,
BSNL is no more a trusted brand. 2 years before, when I was in hyderabad(Ameerpet/hiitech ciity), I was having problem of getting signal. I tried a lot by calling and complaining to their customer care executive.But at last I ported to IDEA.
icame to pune, and one of my friend was staying in Aundh here. in his room, No BSNL network, he shifted to BABUDHAN, there no network on road also. Hinjewadi Phase 2 and 3, BSNL is a nightmare. At last he also ported to Voda.
So my experience, BSNL is the worst network operator, even worst than TATA. May in some states better coverage area, but signal drop and network problem exists across India.